How to make a toast in an onfailure method

Issue

I use OkHttp in a separate service to fetch data from the twitter API. I have been trying to Alert the user that tweets cannot be loaded without an internet connection. But when i try this, the application crashes.The error is java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare(). Here's my code

 private void getTweets(final String topic) {
    final TwitterService twitterService = new TwitterService();
    twitterService.findTweets(topic, new Callback() {
        @Override
        public void onFailure(Request request, IOException e) {
            e.printStackTrace();
            Log.e("Traffic Activity", "Failed to make API call");
            Toast.makeText(getApplicationContext(), "Bigger fail", Toast.LENGTH_LONG).show();

        }

Solution

Probably you are calling Toast.makeText from the wrong thread. It needs to be called from the UI thread. Try this instead

activity.runOnUiThread(new Runnable() {
    public void run() {
        Toast.makeText(activity, msg, Toast.LENGTH_SHORT).show();
    }
});

More informations here Can't create handler inside thread that has not called Looper.prepare()

Answered By - RaffoSorr